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Bug#364777: marked as done (Default configuration for SSLSessionCache in trouble under high load)

Your message dated Wed, 6 Jun 2007 22:43:16 +0200
with message-id <200706062243.16517.sf@sfritsch.de>
and subject line Default configuration for SSLSessionCache in trouble under high load
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what I am
talking about this indicates a serious mail system misconfiguration
somewhere.  Please contact me immediately.)

Debian bug tracking system administrator
(administrator, Debian Bugs database)
--- Begin Message --- 
Package: apache2-common
Version: 2.0.54-5

 We have set the following worker configuration to be able to process large
 number of requests on a https proxy server:

<IfModule worker.c>
StartServers         2
MaxClients          1024
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     64
ThreadLimit         128
ServerLimit         32
MaxRequestsPerChild  0
</IfModule>

 under really high load... servers got into trouble.
 The following error log is then generated:

[error] (120013)APR does not understand this error code: Cannot open
SSLSessionCache DBM file `/var/run/apache2/ssl_scache' for reading (fetch)

 and then the disk IO comes to limit (check with vmstat).

 The following default configuration in /etc/apache2/mods-available/ssl.conf

SSLSessionCache        shmcb:/var/run/apache2/ssl_scache(512000)

 instead of 

SSLSessionCache         dbm:/var/run/apache2/ssl_scache

 would have help us to avoid downtime on our servers - in fact the time to
 understand why the servers cannot server requests and change this parameter

 I'm running Debian Sarge 3.1 - up-to-date - with kernel-image-2.4.27-2-686-smp
$uname -a
Linux elbe 2.4.27-2-686-smp #1 SMP Wed Aug 17 10:05:21 UTC 2005 i686 GNU/Linux

 and libc6 2.3.2.ds1-22


 Hope this may help other administrators to avoid such troubles.

-- 
Yves Martin

--- End Message ---
--- Begin Message --- 
Version: 2.2.3-4

shmcb is the default in the current version in stable/etch. Closing 
the bug.

--- End Message ---
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